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ASTM C305-99

(Practice)

Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency

Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency

SCOPE
1.1 This practice covers the mechanical mixing of hydraulic cement pastes and mortars of plastic consistency.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Jun-1999
Technical Committee
C01 - Cement
Drafting Committee
C01.22 - Workability
Current Stage
Ref Project

Relations

Replaced By
ASTM C305-99e1 - Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
Effective Date
10-Jun-1999
Referred By
ASTM C1910/C1910M-23 - Standard Test Methods for Cements that Require Carbonation Curing
Effective Date
10-Jun-1999
Referred By
ASTM C1810/C1810M-22 - Standard Guide for Comparing Performance of Concrete-Making Materials Using Mortar Mixtures
Effective Date
10-Jun-1999
Referred By
ASTM C806-18 - Standard Test Method for Restrained Expansion of Expansive Cement Mortar
Effective Date
10-Jun-1999
Referred By
ASTM C451-21 - Standard Test Method for Early Stiffening of Hydraulic Cement (Paste Method)
Effective Date
10-Jun-1999
Referred By
ASTM D1734-93(2022) - Standard Practice for Making Cementitious Panels for Testing Coatings
Effective Date
10-Jun-1999
Referred By
ASTM C191-21 - Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle
Effective Date
10-Jun-1999
Referred By
ASTM C1403-22a - Standard Test Method for Rate of Water Absorption of Masonry Mortars
Effective Date
10-Jun-1999
Referred By
ASTM C563-20 - Standard Guide for Approximation of Optimum SO<inf>3</inf> in Hydraulic Cement
Effective Date
10-Jun-1999
Referred By
ASTM C593-19 - Standard Specification for Fly Ash and Other Pozzolans for Use With Lime for Soil Stabilization
Effective Date
10-Jun-1999
Referred By
ASTM C1260-22 - Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
Effective Date
10-Jun-1999
Referred By
ASTM C1713-23 - Standard Specification for Mortars for the Repair of Historic Masonry
Effective Date
10-Jun-1999
Referred By
ASTM C1714/C1714M-23 - Standard Specification for Preblended Dry Mortar Mix for Unit Masonry
Effective Date
10-Jun-1999
Referred By
ASTM C141/C141M-14(2022) - Standard Specification for Hydrated Hydraulic Lime for Structural Purposes
Effective Date
10-Jun-1999
Referred By
ASTM C1738/C1738M-19 - Standard Practice for High-Shear Mixing of Hydraulic Cement Pastes
Effective Date
10-Jun-1999

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ASTM C305-99 - Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic ConsistencyASTM C305-99 - Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
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ASTM C305-99 - Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
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Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 305 – 99 American Association State
Highway and Transportation Officials Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
AASHTO No.: T162
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Mechanical Mixing of Hydraulic Cement Pastes and Mortars
of Plastic Consistency
This standard is issued under the fixed designation C 305; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
NOTE 1—When the bracket is in the proper position beneath the motor
1. Scope
housing, the lugs are to the front and facing upward and the heads of the
1.1 This practice covers the mechanical mixing of hydraulic
adjustment screws are to the rear and facing downward in the path of the
cement pastes and mortars of plastic consistency.
sliding frame that holds the bowl. It is intended that the bracket be
1.2 This standard does not purport to address all of the
fastened at the front housing connection by inserting replacement screws
safety concerns, if any, associated with its use. It is the on an appropriate size upward through the opening in each lug and into the
existing threaded holes in the bottom of the motor housing. The original
responsibility of the user of this standard to establish appro-
stops for the sliding frame are to be filed down if they prevent the frame
priate safety and health practices and determine the applica-
from coming in contact with the adjustment screws.
bility of regulatory limitations prior to use.
NOTE 2—This is the approximate diameter of a grain of 20-30 sand as
described in Specification C 778.
2. Referenced Documents
4.2 Paddle—The paddle shall be readily removable, made
2.1 ASTM Standards:
2 of stainless steel, and shall conform to the basic design shown
C 778 Specification for Standard Sand
in Fig. 2. The dimensions of the paddle shall be such that
3. Significance and Use when in the mixing position the paddle outline conforms to the
contour of the bowl used with the mixer, and the clearance
3.1 This practice is intended for use in the mechanical
between corresponding points on the edge of the paddle and the
mixing of pastes and mortars for the testing of hydraulic
side of the bowl in the position of closest approach shall be
cements.
approximately 4.0 mm but not less than 0.8 mm.
4. Apparatus
4.3 Mixing Bowl—The removable mixing bowl shall have a
nominal capacity of 4.73 L, shall be of the general shape and
4.1 Mixer—The mixer shall be an electrically driven me-
comply with the limiting dimensions shown in Fig. 3, and
chanical mixer of the epicyclic type, which imparts both a
shall be made of stainless steel. The bowl shall be so equipped
planetary and a revolving motion to the mixer paddle. The
that it will be positively held in the mixing apparatus in a fixed
mixer shall have a minimum of two speeds, controlled by
position during the mixing procedure. There shall be provided
definite mechanical means. (Rheostat adjustment of speed will
a lid, made of a nonabsorbing material not attacked by the
not be acceptable.) The first, or slow speed shall revolve the
cement.
paddle at a rate of 140 6 5 r/min, with a planetary motion of
4.4 Scraper—The scraper shall consist of a semirigid rubber
approximately 62 r/min. The second speed shall revolve the
blade attached to a handle about 150 mm long. The blade shall
paddle at a rate of 285 6 10 r/min, with a planetary motion of
be about 75 mm long, 50 mm wide, and tapered to a thin edge
approximately 125 r/min. The electric motor shall be at least
1 about 2 mm thick.
124W( ⁄6hp). The mixer shall be equipped with either an
adjustment screw which is an integral part of the mixer or a
NOTE 3—A kitchen tool known as a plate and bowl scraper conforms to
clearance adjustment bracket such as the one shown in Fig. 1
these requirements.
(Note 1) to provide clearance between the lower end of the
4.5 Supplementary Apparatus—The balances, weights,
paddle and the bottom of the bowl that is not greater than 2.5
glass graduates, and any other supplementary apparatus used in
mm but not less than 0.8 mm (Note 2) when the bowl is in the
measuring and preparing the mortar materials prior to mixing
mixing position.
shall conform to the respective requirements for such apparatus
as specified in the method for the particular test for which the
This p
...

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SCOPE
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SCOPE
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SCOPE
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1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3 The following precautionary caveat pertains only to the test method portion, Section 8 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
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